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I used pass word earlier but for now I removed password and used to login without password. Now some actions need administrators aurthentication through password even to set password I it asks for password but actually there is no password and so it doesn't authenticates any actions that need administrators authentication and when I try to use my old password but it also doesn't works. Now what should I do for this case ?

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Please refer this…. And to site admins , could be a possible duplicate . – atenz Jun 27 '12 at 9:23
up vote 0 down vote accepted

set for boot without password still while installing it asks for password. How to reset or recover the password?

check out this link will help you..

The password it is asking is your your previous password before changing the settings to NO PASSWORD at booting. If you dont remember open terminal write: passwd Then system will prompt for new UNIX password set it as desired.

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thanks Srijan it worked for me :) – Manik Rastogi Jun 27 '12 at 10:26
anytime man. Congrats u resolved your problem. – Srijan Jun 27 '12 at 14:22

Have a look at our guide on how to reset your password using recovery mode, it's fairly simple and should solve your problem :

Have a look at this page on my website for more details.

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